[FancyZones] Make snapping windows using Windows Snap Hotkeys across monitors optional (#2583)

* Make moving window across monitors optional

* Update tests

* Address PR comment: Update description of the toggle

src/modules/fancyzones/lib/Settings.h

@@ -12,6 +12,7 @@ struct Settings
     bool zoneSetChange_flashZones = false;
     bool zoneSetChange_moveWindows = false;
     bool overrideSnapHotkeys = false;
+    bool moveWindowAcrossMonitors = false;
     bool appLastZone_moveWindows = false;
     bool use_cursorpos_editor_startupscreen = true;
     bool showZonesOnAllMonitors = false;